I have two domains, one forwarded to the other. I want to use 2 e-mail accounts on both domains as aliased but some e-mails only on the other domain. I will create 2 MX records for both domains with different priorities.
I wonder that if a mailserver checks domain MX and couldn't find the e-mail account on MX 10 priority server, will it skip to check MX 80 priority server or return "mailbox couldn't find" error?
My MX scenario is as below:
firstdomain.com MX 10 (with only 2 mailbox) seconddomain.com MX 80 (with 2 mailbox and other mailboxes)
I hope I could explaing it clear. Thank you!
Update for theCleaner =================================
The story is: domainA.com: New domain domainB.com: Older domain
My client has an old domain domainB.com and redirected it to domainA.com after purchasing domainA.com. He has many email accounts on domainB.com. Also his john@domainB.com mailbox is active and known by his clients. He wants to buy Exchange mailbox from me. He wants john@domainA.com on Exchange server but also wants john@domainB.com as an Accepted-Domain on Exchange. He will use only john@domainA.com and john@domainB.com on Exchange server. His employees will continue to use emails on domainB.com